/**
 * jQuery lightBox plugin
 * This jQuery plugin was inspired and based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * and adapted to me for use like a plugin from jQuery.
 * @name jquery-lightbox-0.6.js
 * @author Leandro Vieira Pinho - http://leandrovieira.com
 * @version 0.6 [mosgaz]
 * @date Feb 17, 2012
 * @category jQuery plugin
 * @copyright (c) 2008 Leandro Vieira Pinho (leandrovieira.com)
 * @license CCAttribution-ShareAlike 2.5 Brazil - http://creativecommons.org/licenses/by-sa/2.5/br/deed.en_US
 * @example Visit http://leandrovieira.com/projects/jquery/lightbox/ for more informations about this jQuery plugin
 */

// Offering a Custom Alias suport - More info: http://docs.jquery.com/Plugins/Authoring#Custom_Alias
(function ($) {
    /**
     * $ is an alias to jQuery object
     *
     */
    $.fn.lightBox = function (settings) {
        // Settings to configure the jQuery lightBox plugin how you like
        settings = jQuery.extend({

            // Configuration related to overlay
            overlayBgColor:'#000', // (string) Background color to overlay; inform a hexadecimal value like: #RRGGBB. Where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.
            overlayOpacity:0.8, // (integer) Opacity value to overlay; inform: 0.X. Where X are number from 0 to 9

            // Configuration related to navigation
            fixedNavigation:false, // (boolean) Boolean that informs if the navigation (next and prev button) will be fixed or not in the interface.

            // Configuration related to container image box
            containerBorderSize:10, // (integer) If you adjust the padding in the CSS for the container, #lightbox-container-image-box, you will need to update this value
            containerResizeSpeed:400, // (integer) Specify the resize duration of container image. These number are miliseconds. 400 is default.

            // Configuration related to texts in caption. For example: Image 2 of 8. You can alter either "Image" and "of" texts.
            txtImage:'Image', // (string) Specify text "Image"
            txtOf:'of', // (string) Specify text "of"

            // Configuration related to keyboard navigation
            keyToClose:'c', // (string) (c = close) Letter to close the jQuery lightBox interface. Beyond this letter, the letter X and the ESCAPE key is used to.
            keyToPrev:'p', // (string) (p = previous) Letter to show the previous image
            keyToNext:'n', // (string) (n = next) Letter to show the next image.

            // Don�t alter these variables in any way
            imageArray:[],
            activeImage:0
        }, settings);

        // Caching the jQuery object with all elements matched
        var jQueryMatchedObj = this; // This, in this context, refer to jQuery object
        /**
         * Initializing the plugin calling the start function
         *
         * @return boolean false
         */
        function _initialize() {
            _start(this, jQueryMatchedObj); // This, in this context, refer to object (link) which the user have clicked
            return false; // Avoid the browser following the link
        }

        /**
         * Start the jQuery lightBox plugin
         *
         * @param object objClicked The object (link) whick the user have clicked
         * @param object jQueryMatchedObj The jQuery object with all elements matched
         */
        function _start(objClicked, jQueryMatchedObj) {
            // Hime some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
            $('embed, object, select').css({ 'visibility':'hidden' });
            // Call the function to create the markup structure; style some elements; assign events in some elements.
            _set_interface();
            // Unset total images in imageArray
            settings.imageArray.length = 0;
            // Unset image active information
            settings.activeImage = 0;
            // We have an image set? Or just an image? Let�s see it.
            if (jQueryMatchedObj.length == 1) {
                settings.imageArray.push(new Array(objClicked.getAttribute('href'), objClicked.getAttribute('title')));
            } else {
                // Add an Array (as many as we have), with href and title atributes, inside the Array that storage the images references
                for (var i = 0; i < jQueryMatchedObj.length; i++) {
                    settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'), jQueryMatchedObj[i].getAttribute('title')));
                }
            }
            while (settings.imageArray[settings.activeImage][0] != objClicked.getAttribute('href')) {
                settings.activeImage++;
            }
            // Call the function that prepares image exibition
            _set_image_to_view();
        }

        /**
         * Create the jQuery lightBox plugin interface
         *
         */
        function _set_interface() {
            // Apply the HTML markup into body tag
            $('body').append('<div id="jquery-overlay"></div><div id="jquery-lightbox"><div id="lightbox-container-image-box"><div id="lightbox-container-image"><img id="lightbox-image"><div style="" id="lightbox-nav"><a href="#" id="lightbox-nav-btnPrev"></a><a href="#" id="lightbox-nav-btnNext"></a></div><div id="lightbox-loading"><a href="#" id="lightbox-loading-link"><div>&nbsp;</div></a></div></div></div><div id="lightbox-container-image-data-box"><div id="lightbox-container-image-data"><div id="lightbox-image-details"><span id="lightbox-image-details-caption"></span><span id="lightbox-image-details-currentNumber"></span></div><div id="lightbox-secNav"><a href="#" id="lightbox-secNav-btnClose"><div>&nbsp;</div></a></div></div></div></div>');
            // Get page sizessettings.
            var arrPageSizes = ___getPageSize();
            // Style overlay and show it
            $('#jquery-overlay').css({
                backgroundColor:settings.overlayBgColor,
                opacity:settings.overlayOpacity,
                width:arrPageSizes[0],
                height:arrPageSizes[1]
            }).fadeIn();
            // Get page scroll
            var arrPageScroll = ___getPageScroll();
            // Calculate top and left offset for the jquery-lightbox div object and show it
            $('#jquery-lightbox').css({
                top:arrPageScroll[1] + (arrPageSizes[3] / 10),
                left:arrPageScroll[0]
            }).show();
            // Assigning click events in elements to close overlay
            $('#jquery-overlay,#jquery-lightbox').click(function () {
                _finish();
            });
            // Assign the _finish function to lightbox-loading-link and lightbox-secNav-btnClose objects
            $('#lightbox-loading-link,#lightbox-secNav-btnClose').click(function () {
                _finish();
                return false;
            });
            // If window was resized, calculate the new overlay dimensions
            $(window).resize(function () {
                // Get page sizes
                var arrPageSizes = ___getPageSize();
                // Style overlay and show it
                $('#jquery-overlay').css({
                    width:arrPageSizes[0],
                    height:arrPageSizes[1]
                });
                // Get page scroll
                var arrPageScroll = ___getPageScroll();
                // Calculate top and left offset for the jquery-lightbox div object and show it
                $('#jquery-lightbox').css({
                    top:arrPageScroll[1] + (arrPageSizes[3] / 10),
                    left:arrPageScroll[0]
                });
            });
        }

        /**
         * Prepares image exibition; doing a image�s preloader to calculate it�s size
         *
         */
        function _set_image_to_view() { // show the loading
            // Show the loading
            $('#lightbox-loading').show();
            if (settings.fixedNavigation) {
                $('#lightbox-image,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            } else {
                // Hide some elements
                $('#lightbox-image,#lightbox-nav,#lightbox-nav-btnPrev,#lightbox-nav-btnNext,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
            }
            // Image preload process
            var objImagePreloader = new Image();
            objImagePreloader.onload = function () {
                $('#lightbox-image').attr('src', settings.imageArray[settings.activeImage][0]);
                // Perfomance an effect in the image container resizing it
                _resize_container_image_box(objImagePreloader.width, objImagePreloader.height);
                //	clear onLoad, IE behaves irratically with animated gifs otherwise
                objImagePreloader.onload = function () {
                };
            };
            objImagePreloader.src = settings.imageArray[settings.activeImage][0];
        }

        ;
        /**
         * Perfomance an effect in the image container resizing it
         *
         * @param integer intImageWidth The image�s width that will be showed
         * @param integer intImageHeight The image�s height that will be showed
         */
        function _resize_container_image_box(intImageWidth, intImageHeight) {
            // Get current width and height
            var intCurrentWidth = $('#lightbox-container-image-box').width();
            var intCurrentHeight = $('#lightbox-container-image-box').height();
            // Get the width and height of the selected image plus the padding
            var intWidth = (intImageWidth + (settings.containerBorderSize * 2)); // Plus the image�s width and the left and right padding value
            var intHeight = (intImageHeight + (settings.containerBorderSize * 2)); // Plus the image�s height and the left and right padding value
            // Diferences
            var intDiffW = intCurrentWidth - intWidth;
            var intDiffH = intCurrentHeight - intHeight;
            // Perfomance the effect
            $('#lightbox-container-image-box').animate({ width:intWidth, height:intHeight }, settings.containerResizeSpeed, function () {
                _show_image();
            });
            if (( intDiffW == 0 ) && ( intDiffH == 0 )) {
                ___pause(100);
            }
            $('#lightbox-container-image-data-box').css({ width:intImageWidth });
            $('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ height:intImageHeight + (settings.containerBorderSize * 2) });
        }

        ;
        /**
         * Show the prepared image
         *
         */
        function _show_image() {
            $('#lightbox-loading').hide();
            $('#lightbox-image').fadeIn(function () {
                _show_image_data();
                _set_navigation();
            });
            _preload_neighbor_images();
        }

        ;
        /**
         * Show the image information
         *
         */
        function _show_image_data() {
            $('#lightbox-container-image-data-box').slideDown('fast');
            $('#lightbox-image-details-caption').hide();
            if (settings.imageArray[settings.activeImage][1]) {
                $('#lightbox-image-details-caption').html(settings.imageArray[settings.activeImage][1]).show();
            }
            // If we have a image set, display 'Image X of X'
            if (settings.imageArray.length > 1) {
                $('#lightbox-image-details-currentNumber').html(settings.txtImage + ' ' + ( settings.activeImage + 1 ) + ' ' + settings.txtOf + ' ' + settings.imageArray.length).show();
            }
        }

        /**
         * Display the button navigations
         *
         */
        function _set_navigation() {
            $('#lightbox-nav').show();

            // Show the prev button, if not the first image in set
            if (settings.activeImage != 0) {
                if (settings.fixedNavigation) {
                    $('#lightbox-nav-btnPrev').addClass('active_prev')
                        .unbind()
                        .bind('click', function () {
                            settings.activeImage = settings.activeImage - 1;
                            _set_image_to_view();
                            return false;
                        });
                } else {
                    // Show the images button for Next buttons
                    $('#lightbox-nav-btnPrev').unbind().hover(function () {
                        $(this).addClass('active_prev');
                    },function () {
                        $(this).removeClass('active_prev');
                    }).show().bind('click', function () {
                            settings.activeImage = settings.activeImage - 1;
                            _set_image_to_view();
                            return false;
                        });
                }
            }

            // Show the next button, if not the last image in set
            if (settings.activeImage != ( settings.imageArray.length - 1 )) {
                if (settings.fixedNavigation) {
                    $('#lightbox-nav-btnNext').addClass('active_next')
                        .unbind()
                        .bind('click', function () {
                            settings.activeImage = settings.activeImage + 1;
                            _set_image_to_view();
                            return false;
                        });
                } else {
                    // Show the images button for Next buttons
                    $('#lightbox-nav-btnNext').unbind().hover(function () {
                        $(this).addClass('active_next');
                    },function () {
                        $(this).removeClass('active_next');
                    }).show().bind('click', function () {
                            settings.activeImage = settings.activeImage + 1;
                            _set_image_to_view();
                            return false;
                        });
                }
            }
            // Enable keyboard navigation
            _enable_keyboard_navigation();
        }

        /**
         * Enable a support to keyboard navigation
         *
         */
        function _enable_keyboard_navigation() {
            $(document).keydown(function (objEvent) {
                _keyboard_action(objEvent);
            });
        }

        /**
         * Disable the support to keyboard navigation
         *
         */
        function _disable_keyboard_navigation() {
            $(document).unbind();
        }

        /**
         * Perform the keyboard actions
         *
         */
        function _keyboard_action(objEvent) {
            // To ie
            if (objEvent == null) {
                keycode = event.keyCode;
                escapeKey = 27;
                // To Mozilla
            } else {
                keycode = objEvent.keyCode;
                escapeKey = objEvent.DOM_VK_ESCAPE;
            }
            // Get the key in lower case form
            key = String.fromCharCode(keycode).toLowerCase();
            // Verify the keys to close the ligthBox
            if (( key == settings.keyToClose ) || ( key == 'x' ) || ( keycode == escapeKey )) {
                _finish();
            }
            // Verify the key to show the previous image
            if (( key == settings.keyToPrev ) || ( keycode == 37 )) {
                // If we�re not showing the first image, call the previous
                if (settings.activeImage != 0) {
                    settings.activeImage = settings.activeImage - 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
            // Verify the key to show the next image
            if (( key == settings.keyToNext ) || ( keycode == 39 )) {
                // If we�re not showing the last image, call the next
                if (settings.activeImage != ( settings.imageArray.length - 1 )) {
                    settings.activeImage = settings.activeImage + 1;
                    _set_image_to_view();
                    _disable_keyboard_navigation();
                }
            }
        }

        /**
         * Preload prev and next images being showed
         *
         */
        function _preload_neighbor_images() {
            if ((settings.imageArray.length - 1) > settings.activeImage) {
                objNext = new Image();
                objNext.src = settings.imageArray[settings.activeImage + 1][0];
            }
            if (settings.activeImage > 0) {
                objPrev = new Image();
                objPrev.src = settings.imageArray[settings.activeImage - 1][0];
            }
        }

        /**
         * Remove jQuery lightBox plugin HTML markup
         *
         */
        function _finish() {
            $('#jquery-lightbox').remove();
            $('#jquery-overlay').fadeOut(function () {
                $('#jquery-overlay').remove();
            });
            // Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
            $('embed, object, select').css({ 'visibility':'visible' });
        }

        /**
         / THIRD FUNCTION
         * getPageSize() by quirksmode.com
         *
         * @return Array Return an array with page width, height and window width, height
         */
        function ___getPageSize() {
            var xScroll, yScroll;
            if (window.innerHeight && window.scrollMaxY) {
                xScroll = window.innerWidth + window.scrollMaxX;
                yScroll = window.innerHeight + window.scrollMaxY;
            } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
                xScroll = document.body.scrollWidth;
                yScroll = document.body.scrollHeight;
            } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                xScroll = document.body.offsetWidth;
                yScroll = document.body.offsetHeight;
            }
            var windowWidth, windowHeight;
            if (self.innerHeight) {    // all except Explorer
                if (document.documentElement.clientWidth) {
                    windowWidth = document.documentElement.clientWidth;
                } else {
                    windowWidth = self.innerWidth;
                }
                windowHeight = self.innerHeight;
            } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                windowWidth = document.documentElement.clientWidth;
                windowHeight = document.documentElement.clientHeight;
            } else if (document.body) { // other Explorers
                windowWidth = document.body.clientWidth;
                windowHeight = document.body.clientHeight;
            }
            // for small pages with total height less then height of the viewport
            if (yScroll < windowHeight) {
                pageHeight = windowHeight;
            } else {
                pageHeight = yScroll;
            }
            // for small pages with total width less then width of the viewport
            if (xScroll < windowWidth) {
                pageWidth = xScroll;
            } else {
                pageWidth = windowWidth;
            }
            arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
            return arrayPageSize;
        }

        ;
        /**
         / THIRD FUNCTION
         * getPageScroll() by quirksmode.com
         *
         * @return Array Return an array with x,y page scroll values.
         */
        function ___getPageScroll() {
            var xScroll, yScroll;
            if (self.pageYOffset) {
                yScroll = self.pageYOffset;
                xScroll = self.pageXOffset;
            } else if (document.documentElement && document.documentElement.scrollTop) {     // Explorer 6 Strict
                yScroll = document.documentElement.scrollTop;
                xScroll = document.documentElement.scrollLeft;
            } else if (document.body) {// all other Explorers
                yScroll = document.body.scrollTop;
                xScroll = document.body.scrollLeft;
            }
            arrayPageScroll = new Array(xScroll, yScroll);
            return arrayPageScroll;
        }

        ;
        /**
         * Stop the code execution from a escified time in milisecond
         *
         */
        function ___pause(ms) {
            var date = new Date();
            curDate = null;
            do {
                var curDate = new Date();
            }
            while (curDate - date < ms);
        }

        ;
        // Return the jQuery object for chaining. The unbind method is used to avoid click conflict when the plugin is called more than once
        return this.unbind('click').click(_initialize);
    };
})(jQuery); // Call and execute the function immediately passing the jQuery object